问题 问答题 简答题

进油前贯通试压应注意哪几个方面。

答案

参考答案:

①对于检修中更换的新设备,工艺管线贯通试压前必须进行水冲洗。水冲洗时机泵入口须加过滤网,控制阀要拆法兰,防止脏物进入机泵、控制阀;

②贯通试压时控制阀应改走副线;

③炉管贯通时应一路路分段贯通;

④对于塔、容器有试压指标要求的设备,试压时人不能离开压力表,密切注意压力上升情况,防止超压损坏设备;

⑤试压时要放尽蒸汽中冷凝水,防止产生水击,水击严重时能损坏设备、管线。

阅读理解

阅读理解。

     When Daniel woke up yesterday morning, he found he was a bit late for school, so he started running to

catch the bus. Moments later, he saw a dog, but not its lead. He tripped over the lead and fell down. He

jumped up quickly, went on running and got on the bus. After a while an old coach broke down in the middle

of the road, and the driver couldn't move it. It was eight o'clock, the middle of the rush hour, so it soon

created a terrible traffic jam. The bus driver tried to go round the coach. Unfortunately a taxi was coming in

the opposite direction. The driver tried to stop the taxi, but he couldn't prevent the accident- the taxi crashed

into the front of the bus! Luckily nobody was hurt.

     When Daniel finally got to school out of breath, the Science lesson had been on for five minutes. Daniel

said sorry to the teacher and sat at his desk. He reached out for his school bag- no, it was nowhere to be

found. "Where is my school bag?" Daniel was puzzled. Suddenly he realized that he had left it on the bus.

Bad luck!

1. What does the underlined word "tripped" mean?

A. 扔掉

B. 拣起

C. 绊, 绊倒

D. 跨越

2. What is the order of the accident?

①A taxi was coming in the opposite direction

②The bus driver went round the coach.

③An old coach broke down.

④The taxi crashed into the bus.

A. ①→④→②→③

B. ②→③→①→④

C. ③→②→④→①

D. ③→②→①→④

3. What is the best title for this passage?

A. An unlucky day

B. A happy day out

C. A traffic accident

D. A strict teacher

单项选择题